Check the following page in the ArchiCAD Help html file:
Collaboration : Data Exchange : Opening DWG/DXF Files
It tells you about opening DWG/DXF, merging DWG/DXF, also opening DWG/DXF in which case the 3D will also come through.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27